a. It is claimed that new and proprietary encryption ciphers are good because cryptanalysts will not know them. Comment on this. b. What is security through obscurity, and why is it bad? a. What three...

a. It is claimed that new and proprietary encryption ciphers are good because cryptanalysts will not know them. Comment on this. b. What is security through obscurity, and why is it bad?

a. What three protections do cryptographic systems provide on a message-by-message basis? b. What is an electronic signature? c. What two protections do electronic signatures usually provide? d. Distinguish between the handshaking stages and ongoing communication.